{
  "manageEntity": {
    "action": "Save",
    "entityId": "1872366663",
    "entityType": "Track",
    "nonce": "0xd8a5e3e3e1d15c748375bc5524d9c1cfd623ca21b7e4810ce40ff3140feeadae",
    "signature": "0x12845c4aebf3695a9d10ee21a7e00f54f151fead02cf79e0360a530976ae785f355aef323a5c10015a8d0ad7165df71b609627c455fac7c07faab121936821031b",
    "signer": "0xb8270662869c6e1E7EA8A4a51AC83ceca88D2476",
    "userId": "314054174"
  }
}